#include <stdio.h>
#define PI	3.14

int main(int argc, char* argv[]){
	int area;

	if (argc != 2){
		printf ("Usage: %s <radius>\n", argv[0]);
		return 0;
	}
	area = (argv[1]) * (argv[1]);
	area = (area) * (PI);
	printf ("Area of circle given radius %s is %d", argv[1], area); 
	return 0;
}
